Portion of a golf club head



FIG. 1 is a first perspective view of a portion of a golf club head showing my new design;

FIG. 2 is a second perspective view thereof;

FIG. 3 is an elevational view thereof; and,

FIG. 4 is a bottom view thereof.

The broken line showing bounded by the shaded region and the broken line showing of the remainder of the golf club head are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a portion of a golf club head, as shown and described. 